Figure 6Observations of the X-ray intensity change of the U-shape target under three different conditions. The dimensions of counts s-1 W-1 can be changed to the brightness expression of photons s-1 mm-2 mrad-2 (0.1% bandwidth)-1 W-1 by multiplication by the coefficient constant 0.36 × 105; and where the focus size was S = 1.96 × 10-3, the pinhole area was s = 78.54 µm2, and the pinhole distance from the focus point L = 75 mm, namely, s/L2 = 1.4 × 10-2 mrad2 (0.1% bandwidth) being that of the Cu K band pass.